will have to wait a little bit longer. launch was delayed because of a flight problem. our correspondent is live at cape canaveral with the very latest. scott, any idea when the shuttle will take off? >> we understand, by the way the president spoke with gabrielle giffords for about 10 minutes. speaking of which on the counter behind me, there is a plus symbol, never a good sign. the problem is in the auxiliary power unit. they have to build platforms just to get to the problem area. either way, we are looking at least a 72-hour delay. 15 minutes before boarding with the world watching, the word everyone dreads.